from ftp.astron.com, this is a bug fix release:
       * always leave magic file loaded, don't unload for magic_check, etc.
       * fix default encoding to binary instead of unknown which broke recently
       * handle empty and one byte files, less specially so that
         --mime-encoding does not break completely.
       * fix erroneous non-zero exit code from non-existant file and message
       * add CDF MSI file detection (Guy Helmer)